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Titolo:
WIND OBSERVATIONS OF THE INFLUENCE OF THE SUNS MAGNETIC-FIELD ON THE INTERPLANETARY MEDIUM AT 1 AU
Autore:
SANDERSON TR; LIN RP; LARSON DE; MCCARTHY MP; PARKS GK; BOSQUED JM; LORMANT N; OGILVIE K; LEPPING RP; SZABO A; LAZARUS AJ; STEINBERG JT; HOEKSEMA JT;
Indirizzi:
EUROPEAN SPACE AGCY,EUROPEAN SPACE RES & TECHNOL CTR,DEPT SPACE SCI,KEPLERLAAN 1,POSTBUS 299 NL-2220 AG NOORDWIJK NETHERLANDS CNRS,CTR ETUD SPATIALE RAYONNEMENTS F-31029 TOULOUSE FRANCE STANFORD UNIV,CTR SPACE SCI & ASTROPHYS STANFORD CA 94305 UNIV CALIF BERKELEY,SPACE SCI LAB BERKELEY CA 94720 UNIV WASHINGTON,DEPT GEOPHYS SEATTLE WA 98195 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB GREENBELT MD 20771 MIT,CTR SPACE RES CAMBRIDGE MA 02139
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
fascicolo: A8, volume: 103, anno: 1998,
pagine: 17235 - 17247
SICI:
2169-9380(1998)103:A8<17235:WOOTIO>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
HELIOSPHERIC CURRENT SHEET; PLASMA; SPACECRAFT; CYCLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
T.R. Sanderson et al., "WIND OBSERVATIONS OF THE INFLUENCE OF THE SUNS MAGNETIC-FIELD ON THE INTERPLANETARY MEDIUM AT 1 AU", J GEO R-S P, 103(A8), 1998, pp. 17235-17247

Abstract

We combine data from several instruments on the Wind spacecraft with ground-based observations of the position of the heliospheric current sheet for the first 2.5 years of the mission, which covers the period from the end of solar cycle 22, through solar minimum, and into the start of cycle 23. We use data from the three-dimensional (3-D) plasma instrument (3DP), magnetometer (MFI), and Solar Wind Experiment (SWE). We examine the energetic ion and electron increases associated with corotating interaction regions (CIR) and relate them to the position andshape of the current sheet. The characteristics of the energetic particle increases associated with the observed CIRs change several times during the mission. We identify these periods and find that we can relate these particle signatures of the CIRs to the plasma conditions which themselves depend upon the changing tilt and warp of the current sheet. We examine the additional increases associated with magnetic clouds and impulsive solar flares that were observed at irregular intervals during the mission. We show how the Sun's magnetic field influences the interplanetary medium at 1 AU, as variations in the shape and inclination of the source surface current sheet propagate out to 1 AU. We identify the three major sources of these variations, (1) the long-term, slowly varying tilt of the current sheet with a timescale of the solar cycle, (2) the medium-term small but significant annual movement of the position of the Earth relative to the current sheet due to the inclination of the plane of the ecliptic with respect to the heliographic equator, and (3) the short-term warps and bulges which come and go due to the appearance of active regions, lasting only a few solar rotations.

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Documento generato il 05/07/20 alle ore 09:36:15